AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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rick reynolds
August 02, 2019 03:55PM
Hi Gerome,

This looks good. The AM there is really to say there is *some* sort of modulator in the timing file. In this case, it is using duration modulation (which is why AM1 is used, rather than AM2, which would be more typical for amplitude modulation). Applying dmUBLOCK(0) (or just dmUBLOCK) will be the same as using dmBLOCK, except that the peak of a full (15+ second) convolution will be at 1, meaning the resulting beta weight would be the actual percent signal changed for a fully convolved event. That is also appropriate here, since the events are all longer than 15 seconds. If you plot the regressors, they should all scale up to 1.0.

This looks good to me.

- rick



Edited 1 time(s). Last edit at 08/05/2019 12:42PM by rick reynolds.
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Subject Author Posted

Choosing the right basis function (old data mystery)

GMan August 02, 2019 02:11PM

Re: Choosing the right basis function (old data mystery)

rick reynolds August 02, 2019 03:55PM

Re: Choosing the right basis function (old data mystery)

GMan August 05, 2019 06:45PM